TCF Canada or TEF Canada: two tests, one goal
For an application for permanent residence or Canadian citizenship proving a level of French, two tests are recognized by Immigration, Refugees and Citizenship Canada (IRCC): TCF Canada, issued by France Éducation International, and TEF Canada, issued by the Paris Île-de-France Chamber of Commerce and Industry (CCI). Neither is "superior" to the other: IRCC accepts results from either indifferently.
What they have in common
Both tests assess the four skills (listening comprehension, reading comprehension, oral expression, written expression) and convert their results into Canadian Language Benchmarks (CLB/NCLC), the scale used to calculate points in the Express Entry system, whether for the federal Skilled Worker Program or provincial programs, including Quebec's Regular Skilled Worker Program.
What sets them apart
How to choose in practice?
Neither is officially easier: both convert to the same NCLC levels. The deciding factor is therefore mainly practical: choose the test offered by the most accessible accredited centre near you, within the timeframe matching your Express Entry schedule. If in doubt, prepare using past papers of the test you actually plan to take, as the question style differs noticeably. For precise details on the TEF, check the official page of the Paris Île-de-France CCI.